Как таскать форму за метку?

procedure TForm1.Label1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
  const SC_DragMove = $F012; { a magic number }

begin
  ReleaseCapture;
  Form1.perform(WM_SysCommand, SC_DragMove, 0);
end;